Medical Billing Time Limits by State: 2026 Guide

Every payer sets its own clock. Medical billing time limits by state decide whether a claim gets paid in full, gets written off, or ends up on the patient's statement instead. We talk to front desks and billing staff every week who track these deadlines on a spreadsheet, a sticky note, or nothing at all. This guide walks through where the deadlines come from, how Medicare, Medicaid, and commercial payers differ, and what a practice can do before a deadline gets missed.

A timely filing limit is the number of days a payer allows between the date a patient is seen and the date a clean claim must reach the payer's claims address or clearinghouse. Medicare sets this deadline at 12 months, one calendar year, from the date of service. Medicaid programs set their own limits, and state by state those limits commonly run from 90 days to one year. Commercial insurance carriers set their deadline inside the provider contract, and the common range runs from 90 days to 365 days from the date of service. Missing the deadline does more than slow a payment down. A late claim is denied for timely filing, and in most provider contracts that denial cannot be appealed. The practice absorbs the balance, not the payer and not the patient. Because the deadline comes from the payer contract and not from state law in most cases, two offices in the same city can have different filing windows for the same procedure, on the same day, depending only on which plan the patient carries.

For the dental side of this same question, including how these deadlines show up on a claim form, see our dental billing time limits by state guide.

Medicare's 12 month rule is a federal standard, so it does not change by state. The clock starts on the date of service, not the date the claim is prepared and not the date an explanation of benefits comes back from a secondary payer.

Medicaid works differently. Each state runs its own Medicaid program, so the timely filing window is set by that state, not by Medicare's rule. Some states give providers a full year. Others give far less, sometimes 90 days or 180 days. The number can also change when a claim needs a secondary submission after Medicare or another primary payer has already paid. The only reliable source for a specific state's Medicaid deadline is that state's provider manual, because the figure is updated on its own schedule and does not always match what shows up in a general search.

Commercial insurance runs on contract, not statute. Every payer contract a practice signs sets its own timely filing clause, and that clause can run anywhere from 90 days to 365 days from the date of service. A practice in network with five payers can be looking at five different deadlines for the same visit, and the contract, not a public chart, is the document that actually settles it.

Timely filing limits govern what a payer will accept from a provider. They say nothing about how long a provider has to bill the patient directly. That second clock is set by state contract law, specifically the statute of limitations on debt, and it is a separate question from timely filing.

Most states set that statute of limitations somewhere between 3 and 10 years, and it usually starts from the date of the last payment or the date the balance became due, not the date of service itself. We wrote a full walkthrough of how long after a date of service a provider can bill a patient, since the answer depends on the state and on whether the balance is patient responsibility or a denied insurance claim.

A hospital sending a bill two years after a visit is not automatically illegal. It depends on the state's statute of limitations and on what the provider's contract with the payer required along the way. If the insurance claim itself was filed late, the payer can deny it outright, and some states restrict whether that balance can then be passed to the patient. Balance billing rules vary by state, and we cover the legal side in our guide to dental balance billing.

A claim that arrives after the timely filing window gets a denial code, not a payment, no matter how clean the claim is otherwise. Most contracts list timely filing denials as non-appealable, so the usual appeal and resubmission process does not apply. A practice can try anyway, but the success rate is low enough that most billing teams write the balance off instead of chasing it. We cover the denial codes that show up most often, including timely filing, in our front desk guide to dental denial codes.

The real cost shows up two ways. First, the provider already saw the patient and did the work, and now that production is gone. Second, writing off a timely filing denial still takes staff time. Someone has to find the claim, confirm the date of service, confirm the deadline, and document why the balance is being adjusted off. None of that work would exist if the claim had gone out on time.

Most practices we talk to track filing deadlines one of three ways: a spreadsheet updated by hand, the aging report inside the practice management system, or memory. All three work fine until the front desk gets busy, a claim sits in a batch for a week, or the one person who tracks deadlines is out for the day.

A lot of claims go wrong before they are ever filed, at verification. A claim built on the wrong group number, the wrong plan, or a policy that lapsed last month comes back denied for reasons that have nothing to do with the filing date, and fixing it burns days off the clock while the office tracks down the right information. The office runs that check itself: sign in and check any patient in one click, before the visit, so the claim your office eventually sends starts from confirmed coverage instead of a guess.

Claims and collections, the next step after verification, is in development at Valian. We are taking on our first offices now to build that piece around real claim queues and real payers, not a demo. What is live today is the verification step described above. You can read more about how verification works in our guide to automated insurance verification, or see the full approach on our revenue cycle management page.

If your office is writing off claims to missed deadlines, book a time to walk through your claim queue with us.

Can a hospital send a bill 2 years later?

In most states, yes, as long as it falls inside that state's statute of limitations for debt, which usually runs longer than 2 years. The insurance timely filing deadline is a separate clock and is almost always shorter, often 90 days to 12 months, so if the hospital missed the payer's deadline the claim itself may already be denied.

How long after a date of service can you bill a patient?

The answer depends on the state and on the type of balance. The window for patient responsibility balances is usually longer than any payer's timely filing limit, and it is set by the state's statute of limitations on debt rather than by insurance rules.

Can a doctor bill you 5 years later?

It depends on the state's statute of limitations on debt, which commonly runs between 3 and 10 years depending on the state and the type of contract involved. Five years falls inside that range in many states, so it is possible, though uncommon in practice.

Can a doctor bill you 6 months later?

Yes. Six months is well inside almost every state's statute of limitations, and it is also inside most commercial timely filing windows, so a bill arriving at 6 months is common and not unusual.